Piston



Patented May 8, 1928.

@wie

saine timey `permitting the pumping iofoil4 and the4V accumulation of carbon,' as Well' eliminating piston slaps.

One of the `important objects of the piresentinvention is tol provide a piston,`wli`erein` "leakage of oil `around tliefpiston Willbe prevented, the piston Lbeing furtherof such conF structiom as to prevent" any poss'lhilityf of* compressioii 'escaping 'around' the piston; the

piston beingfurtheriadapted to take up any weer which in'ayoccur on the piston rings.

yA further Objectis tpiprovidelapistonof the above inientined character whicliiis siniple in constructiongstrong and di'irahlezand otherwiseiv'ellj adaptedforthe purpose for vention* will become apparent during the i course 'of the 'following A`detailed description.

In the accompanyingdrawing;"forming a"` i"' i .l L. v W, -i Vi part` ot this application, land iii ivliich 1like reference characters designate like parts i throughout the severalv views l Figure 1 is alviewu'partlgy in'eleyatioIi-'and' partly ini sect-.ioni` of my iinprovedf,piston"` construction,` showing` thelnianner in which the several `parts are held in assembled relii'' tion;

" ingiflthe piston ringiin topfplaii elled lockingfriiig; and l v Figure 4 is a cross sectional View throughl oiieo the paclciiig rings.

` In the. drawing; wherein for the purpose of illustration isf s hoivn the preferred ern-1J FigureB bottoni plan Vvieu' of the hey hodiinent iny .nventiomjzl designates the body portion oftthe piston, tlieiippei" phrtion thereofheingireducedas illustrated at" 2. The shouldeii formed aththe juncture ot the body ivitlifthel` reduced portion1 isl formed at its outer edge with thebevelled porti on LLeythe purpose of'w'fh ich vuiillfhe lierc- I in after more fully* descrih'edl' The upper end ofitlie reducedportion externally .threaded and' cooperating there with is the internallyV` threaded flange `orr sleeve portion `f 5, formed on "the bottoni f' of" the'lieadf; In thi'smiinner, thelhead may be readily attached or' detached" from" the upper end of the reduced'y portion 2 andthe dianieter` .of thisl `head `is `substantially the same` as the'outer diameter of the body 1.

The `.purpose ofr mounting the detachable head 6in' the particular manner as shown u Will.` bei hereinafter more fully described Adapted to encircle the reduced portion 2 of vthei lodyql are `the super-posed sleeves or bands T. Inlthe present instance, two of suoli elements are shown;` 'although it is to be i understood that I. do lnotwish to limit fniyself to thelparticular'numher of hands or sleeves which may?v be employed. The lower edgejof thllowririostfband or sleeve 7 restsA onjithe shoulder 3," while the lower edge of theiipper sleeve or band engages the upper edge'of jtlfe lovverniost sleeve.` The outer edge ofthe' annular fla-nge or sleeve 5 forineill on theibottoni of thelieud, ivill engage the upper edge ot the uliperiiiost sleeve, in the. Amanner as clearly illiistfrated` in YFigure 1.

These sleeveswor' bauds T'aie adapted to slide freelyl over the reduced portion Bof tlie'hody 1,` whenftl'ieihead` n per e'nd" oftheri-educed portion.-

An annular flange. 8 is formed on the up-y per edge portion of eacliof the sleeves or bands"7 and these fianges extend' laterally fronli'therespective sleeves or bandspso that l" the outer diameter of the flange will be sub'- stantia-l'ly the saine as the outer' diameter-lof the hody1..A"bevelled ledge Slis `formed on tlieful'jperfface of Aeafch flange 8, adjacent iis outer periplierlledge, ascleaily illustrated in Figiirell, aidthe'piirpose thereof ivill'lhe presently apparent..

An eccentric rbl() isformed on the interiiiediate `portion of'tlieouter peripheral face of" each hand orsleeve 7 and as is clearlv slioivii in iure 1., the 'ividest ifiortion of each eccentric rib; has its peripheral edge disposed fiusliliwith the outer peripheral face of the bodyil1 and the fianlgesS formedzon` the sleeves 7. The ribs 10 ivill iorin upper and loiverv `pac1 ing"ring` receiviiig'channels 1]. and 12l'respectively,iin each of the sleeves.

A similar eccentric riblis `forii'ied on the outer peripheral face of Y the depeniiling" flange or` sleeve .5 formed `onthe bottoni of the head 6, and this lastnieiitioiiedurih 4also is `detached from the uplUl ceiiiiiig'chan'nels siiiiilir tothe channels 1l Y and 12.\V y t Ach'annelshapedpiston"packing ringv 14 has Q its` inwardly directed L sides 'arranged in iiiewhfannei's i1' and 12 "respectively pro! vided therefor in each of the sleeves or bands 7, as well as the depending'flange orV sleeve 5 formed on the bottom of the Vdetachable head 6. Each packing ring is also of eccentric formation, and is split, as illustrated at 17, with reference more particularly to Figure 2. The wider portion of each piston packing ring 14` isdisposed on opposite sides of the eccentric rib 10, so that the wider portion of the packing ring will be disposed against the respective sides of the narrowest portion'of the rib, and this is clearly shown in Figure 1. The base portion 1S of each packing ring encircles the respective rib ltlin the manner as clearly shown in Fig. 1.

The channeled packing ring 14 has its upper face disposed against the bottom face of the flange 8, and for the purpose of retaining the packing rings 14 in engagement with the respective ribs, I provide the bevelled locking rings Q0. The bevelled faces of these rings co-act with the bevelled ledges 9 of the flanges S and the lowermost lockingI bevelled ring cooperates with the bevelled portion d formed on the shoulder 3. In this manner, the packing rings will be properly positioned in the channels formed by rthe several ribs on the sleeves or bands i and the depending flange or sleeve 5 on the bottom of the head 6. The bott-om face of the lowermost packing ring will engagevthe upper ,flat face of the respective bevelled locking ring 20, as clearly illustrated in Figure 1. 1

These bevelled locking ringsare also freely slidable over the reduced end 2 of the body portion 1, and are split as indicated at Elin Figure 3.

After the sleeves and locking rings as well as the packing rings have been properly positioned on the reduced portion 2 of the body 1 and the head 6 is tightened on the upper threaded end of the reduced portion Q, a locking wedge shaped pin 23 is driven through suitable registering openings provided therefor in the head 6 and the top of [he reduced portion 2, and this is clearly illustrated at E23, in Figure 1. This locking means will prevent any possibility of the head G being disengaged or from rotating with respect to the reduced portion of the body 1.

The provision of a piston construction of the character above described will insure an eflicient operation of the internal combustion engine with which the piston may be associated so that oil will be prevented from escaping past theV piston rings as well as eliminating the collection of carbon andpiston slaps. 1 `urther1nore` a piston constructed in accordance with the present invention will automatically take any wear which may occur by the packing rings coming in contact with the wall of the cylinder.'

bodiment of my invention, it is to be understood that various changes in the size, shape and arrangement of parts may be resorted to, without departing from the spirit of the invention or the scope of the appended i claims.

What I claim is:

1. A piston comprising a body portion, the ripper end thereof being reduced, a series of superposed bands encircling the vreduced portion, a lateral flange on the upper edge portion of each band, an eccentric rib formed on the outer peripheral face of each band at the intermediate portion thereof, a Vsplit channeled eccentric packing ring encircling each band and its rib, the uppermost portion of each channeled packing ring en aging the vbottom face of the flange former on the band, means for maintaining the lowermost portion of the channeled ring against the bottom of the respective eccentric rib and a flanged head secured on the upper end of the reduced portion for locking the bands against vertical sliding movement.

2. A piston comprising a body, the upper portion thereof bein reduced, a series of superposed bands cnc1rcling the reduced portion, a lateral flange on the upper edge portionof each band, an eccentric ribformed on the outer peripheral face of each band at the intermediate portion thereof, a split channeled eccentric packing ring encircling each of the aforementioned bands and its rib, the uppermost portion of each packing ring engaging the bottom face of the flange formed on the sleeve, a locking ring interposed between the bottom portionof each packing ring and the upper face of each flange formed on the sleeve for holding said packing ring in position on the respective rib, and a head detacliably secured on the upper end of the reduced portion for locking the bands against sliding movei'nent on the reduced portion of the body.

3. A piston comprising a body, the upper portion thereof beingreduced, a shoulder formed at the juncture of the reduced portion with the body, theouter edge portion of said shoulder being bevelled, a plurality of superposed bands encircling the reduced portion, the lower edge Vof they lowermost band engaging said shoulder, a lateral flange formed on the upper portion ofveach band, a bevelled ledge formed on the upper face of each flange at the outer edge thereof, a head detachably secured on the upper end of the reduced portion, an eccentric rib formed on the outer peripheral face of each band atthe intermediate portion thereof, a. split channeled eccentric piston packing ring encircling each of said bands at its eccentric rib, the uppermost face of the channeled packing ring' being disposed againstvthe bot-` tom face of the lateral fiange formed on each band, and bevelled locking rings encircling the lower portion of each band and cooperatingwith the aforementioned bevelled ledges for holding the bottom portion of the packing' ring against the bottom face of the respective eccentric rib.

4L. A piston comprising a. body, the upper portion thereof being reduced, a: shoulder formed at the juncture ofthe reduced portion with the body, the outer edge portion of said shoulder being bevelled, a plurality ot' superposed bands encircling the reduced portion, the lower edge of the lowermost band engaging said shoulder, a lateral flange formed on the upper portion of each band, a bevelled ledge formed on the upper face of each flange at the outer edge thereof, a head detachably secured on the upper end of the reduced portion, an eccentric rib formed on the outer peripheral face of each band at the intermediate portion thereof, a split channeled eccentric piston packing ring encircling each of said bands and its eccentric rib, the uppermost face of the channeled packing ring being disposed against the bottom fece of the lateral flange formed on each `band, split bevelled locking rings encircling the lower portion of eachband and cooperating' with the aforementioned bevelled ledges for holding packing rings in position around therespective eccentric ribs, said head adapted to secure the bands against sliding Inove- 'ment on the reduced portion, and means for locking the head against accidental movement on the reduced portion of the piston.

In testimony whereof I ax my s1gnature.

CHARLES W. DARRAH. 

